This is all about missions and campaigns for ArmA 3.

Campaign Description.Ext

When you are creating your ArmA 3 campaign and if you get this error:

Warning Message: No entry 'Campaigns\<NAME>\description.ext/Campaign.briefingName'.

You need to add one line in description.ext file:

briefingName = "My Campaign!";

And its fixed.

Campaign Missions

mission\description.ext new features for ArmA 3:

author = "Snake Man"; // Author
onLoadName = "PMC 2 mission"; // Mission name (temporary solution; actual name set in editor will be used later in the alpha)
onLoadMission = "Prepare to defend yourselves!"; // Description
 
class CfgDebriefing
{
	class End1
	{
		title = "End1 Activated";
		subtitle = "";
		description = "Yeah end1 rulez";
		backgroundPicture = "";
		picture = "b_inf";
		pictureColor[] = {0.0,0.3,0.6,1};
	};
 
	class pmc1
	{
		title = "PMC 1 Activated";
		subtitle = "";
		description = "Yeah pmc1 rulez";
		backgroundPicture = "";
		picture = "b_inf";
		pictureColor[] = {0.0,0.3,0.6,1};
	};
};

Then any script or trigger during mission to end it:

[ "end1", true, 2 ] call BIS_fnc_endMission;

Or

[ "pmc1", true, 2 ] call BIS_fnc_endMission;

Its very cool now that we can define our own mission ending setups and are not limited to the existing 7 mission ending triggers available.

ArmA 3 Mission file name length, see ArmA 2 - Mission File Name Legth Limit